Study On The Preparation Of Modified Foam Nickel Material And Its Catalysis Performance

Material, energy and communication are the three pillay industry of21stcentury. Foam nickel is a new function material, which is sponge-like material madeby nickel metal through high-tech further processing, which has the advantages ofthree dimensional mesh structure, porosity of about1-2mm, strong corrosionresistance, hollow skeleton, metallurgical state cross-linked porosity, bulk density,thermal shock resistance, inherent tensile strength and large specific surface area.The foam nickerl material can be used for separation of hydrogen isotope byeletrolysis due to its strong alkali corrosion resistance in alkaline environmen,network structure and huge specific surface area, which gives rise to small currentdensity and low overpotentia. Foam nickel has not only feature of high porosity, butalso good machining performance, stability and favourable hydrodynamicperformance, and water or gas could get through it, which lead it to be surpport forphoto-catalyst. This paper reviews the application of foam nickel in photocatalysisand electrocatalysis, especially research in hydrogen evolution and photocatalysissupporter. The main points of this dissertation are summarized as follows:（1）. Preparation of calalytic material; The modification of foam nickel, theappropriate current density for electro-deposition of Ag on foam nickel was got bytentative electrofacing in Hull Cell. Ni/Ag-WO₃, Ni/Ag-ZrO₂, Ni/Ag-ZnO,Ni/Ag-ZrO₂and Ni/Ag-Pt-C were prepared by codeposition of Ag and TiO₂, ZrO₂,Pt-C, ZnO and WO₃on foam nickel in constant current. As the electrocatalyst andphotocatalyst in this article, Ni/Ag-TiO₂has not only characteristic ofelectrocatalysis, but also photocatalysis, so Ni/Ag-TiO₂were electrocatalyst andphotocatalyst at the same time. Investigation of The electrochemical properties ofNi/Ag-TiO₂, Ni/Ag-ZrO₂and Ni/Ag-Pt-C in the presence of potassium hydroxidesolution has been employed by Tafel and EIS. Morphology and composition ofNi/Ag-TiO₂, Ni/Ag-WO₃, Ni/Ag-ZrO₂, Ni/Ag-ZnO were studied using the scanningelectron microscopy （SEM） and energy dispersive x-ray （EDS）.（2）. The establishment and application of the separation factor test system;electrolytic cell was designed for the electrolysis of alkaline mixed aqueous solutionused using CAD software in this article. Filler was got by manganesechloride-modified activated alumina. analytical column and the reference column were made by stainless steel column filled with homemade filler. Liquid nitrogencryogenic cooling and extended reference-analysis of two stainless steel columnswas designed,（L:5m, Φin:3mm, Φout:5mm）. H2, HD and D2were separated byinert gas helium as carrier gas driving them through analitc column and thendetected by TCD detector. Preparation of H2and D2were prepared by electrolysis ofH2O and D2O. preparation of standard samples, the work lines of H2, HD and D2were got. Protium and deuterium were separated by electrosis for KOH mass fractionof30%in a mixed aqueous solution H2O-D2O Using the above-described modifiedfoamed nickel-based electrode material. Quantitative detection and calculationwhich protium and deuterium ratio produced by electrolysis of H2, HD and D2weregot Using the above-mentioned low temperature elution chromatography. Infraredspectrophotometry to determine H2O and D2O for the KOH mass fraction of30%inthe H2O-D2O mixed aqueous solution dielectric and calculate the ratio of deuteriumprotium. Calculated the separation factor of the electrode material under theelectrolysis conditions.ration factor of them were got.（3）. Evaluation of photocatalytic performance for Modified foam-basedphotocatalytic materials; The systerm for evaluation of photocatalytic performancewas established Using the main wavelength of254mn ultraviolet lamp as the lightsource of photocatalytic reaction. At room temperature and normal pressure,Photocatalytic reactor was made and toluene as indoor air pollutants to simulateindoor environment.. Toluene and xylene were quantitative detected Using GC （FIDdetector） and working curve of toluene and xylene were drawed. Ni/Ag-WO₃,Ni/Ag-ZnO₂and Ni/Ag-TiO₂were used to be photocatalytic materials forphotocatalytic test.and pollutant concentrations were monitored using gaschromatography in the photocatalytic reaction device. The initial concentration ofthe reactants and humidity on pollutant removal efficiency were discussed.Degradation kinetic model was proposed and photocatalytic degradation factors wasinvestigated, such as the band gap of the photocatalyst, degradation humidity,temperature, and light intensity. Evaluation of these three catalytic photocatalyticperformance were complete.